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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd94f7f7262f8c0eaa4bd927a24798d306f1e0b7de3d331e51ad8c7afeb89596a' 
  AND token = '1ZmQIGq0DYytgHOiZZxd96hHH8oE9arM+ZglfafrHZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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