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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0b5bc5dd1a56103cdfd7539596c27cb02df4445cf86b4d776f4e554ee5e57a5' 
  AND token = '50iVfkOzSaCCfhoJheSPKqgCr9Gkd+cMiDVs8EOZZq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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