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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7acd23613d156005d0b405f1ac770baff6535f6aca566b18048ce6362a1bb288' 
  AND token = 'SBgKqU990IDfC82nnjPjbS/a6CyGGUBaxm7g2dMfN7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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