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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f735b79feabf9bfbc2743c5a0a494e571f937c0f1953519b5f41102cf5dba18d' 
  AND token = 'EofPuhLGM5EonfjiEm1zVeCUdHsQbLHIDmpkh1wV96g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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