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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fb3b1dc89760c64f072c7838521cf6f0152f44be44f257ccd23aaf796b89e12' 
  AND token = 'xIepQe/eiDAEAqw9KLE8e4N3HR7aPSK/WcStcu0WVMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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