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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67964847821348abdcdccf3bade99f1f9415c886ee445e685a345f4c261917b9' 
  AND token = 'FZHPG/W0vLtD4etSmSc+yqbYlj86B6xtwEWdtY5z2v8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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