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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c2cb679c001e7cc35d33624f3027b2da601dc454dae15da249e1679456fdb2d' 
  AND token = 'oQs0NhPBnLA7ErDyjQ2cTOc+UhcScuk0IeBPR985a7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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