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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1f683e56c9f7eced622047c9bb6dd70a4704c9ac337cde6f240b6e340b166d7' 
  AND token = 'ke7WFK1iwlF+EWYUA1zlHH52KjizUtI6TGLhnQC61y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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