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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7e207083f0fbb76d3bde9a7a3889cc4f9d0d6e37d024ac420cf92fce7420122' 
  AND token = 'NWfbU6oQSKRJxbdvY275mKxLn7S9M46clF0khwI1z/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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