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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3b2d1acd354b9d0ac7a0eabd27cc7afdf321654e59af276a6a798b4c2240e0b' 
  AND token = '4kLz3vXskoM5TsRMyu5tiLZdjfI5mU/YgPcITQa/D14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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