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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28be39bcb8778221ae557a724605c8053d68d9ff640177de2c79af5efa040d9b' 
  AND token = 'fpwXdApsFoa22Y52E65+2xabQXoicOLEOsGT1HwEejk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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