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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad69b18d845edf6b8030dab97e063d1664a9c3789585de48949a3bebbedf4469' 
  AND token = 'Q5/LR44CwWgAQVUMK7p5J8+Ah9a4VALlSs8701A/9mM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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