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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f07d693d27eb0a0f16840bfbb7b0533239ceeac5279e8215658f2154a7cb53f7' 
  AND token = 'dUJmY8xQ2z+Tb21pmDO0TS2Watk5N5gh2mZVrqH/okQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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