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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74a3f3990f18390506235a0695ea6a3ec7d141f9e250c1b685ed77230ad9d853' 
  AND token = '0gXIW2K9LVmSqoWbPEgfkqeQb/8eXfnPiKYwyWhUaOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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