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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a597142116d82590e2ec5274f2adc3a1d8ff48111d5148488b2bcc1af3fa603' 
  AND token = 'lBHWkaxrFTgc0ATA5WOPvatmBV3IVv6R3e0pGC5qm1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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