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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beb0e46b5ce238cdae05339baf8cd41682d63657a9bf155cdee3f0789ffe8d94' 
  AND token = 'pN2z34/OwENf8q5ylfy3P/QQy2Is2wu1bi+L8IwdcIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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