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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '141af6e0b7dbdae0587786a5b019ca327b67b123ea626f53e4ec98b23207236e' 
  AND token = 'BOQZ8XUb0vqdgoBpJgca5vXeSLFGLijyu1r+1SaM960=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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