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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e40481ff3cab6cd11d97d87d736bf2e7c97f76aa6db7f5b270b6dc9432eb461' 
  AND token = 'DLrRw41y/KoX78xAi8/nn6n8Tqy3s3+p1cgCW2UwODE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}