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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ecc20aed35e30c7718b0766c3023cc614f6685ae7eb4c5cb1df80d8548bfc6d' 
  AND token = 'UP29A8DWVAUIX3orPOSYH5j5FWayzMl+34/SuzMYuH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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