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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a2a71d4f971fea8b57a2b6a2d2aa2ffc3cd7be94ed81a266ca2b9355749c77b' 
  AND token = 'L5VifVP92ueMCePuXVEmgjMsAgUqt0OWHr+Ne9M2hng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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