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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2d96db10ca978f9c2b5834bc27821f4cb9592cebc8b3da1de5f110766c973d1' 
  AND token = 'w2/sbVgZkMPX69caKBaqxS9uLQtpgo8COi3xj7Czfaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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