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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39a0a6fe0981ad035e3f91d8b85d210bee7fa8214eb2b6dbdf910db3976d2cef' 
  AND token = '9pkvhuu958et+dBmSwX3s4E26orcVtv8YoQR/lWXFd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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