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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bf64db3682a5e827e6d4642bc1fc7f1ec432519f32765753e24aebee53e7f51' 
  AND token = 'VShmO3rx9OTffOegQztYPw4Ezb6ok6fQ/34duZ/C3sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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