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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd9cc86d0f6daafc1d3e05202d20ce17aa27e7a5f38f37c11522d10a7a737622' 
  AND token = 'lPRKmIb00nMpVAGi/1DzPpO9ySA8HS23xJzq7YWfqi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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