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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be423c2544bfca2191f087f57001998259bd4dd2a512e856c12ae29832680016' 
  AND token = 'BAh1LHl2yod7hK9lsKA2KoXNFQ/fOiNbOUfMrJ/3wIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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