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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '823c48ba13cda8ba9e8637de504e51c64e2998e54b8c82abbccace37d4c4891d' 
  AND token = 'IovEhcAH3TWFTe71y2IBl8KPHvFRr3M/SLPWR89P5Do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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