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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58bf6acca0e07cdfaf5a5c4a4cc332806077dd00a6c773e985a14255409385b2' 
  AND token = 'pSe4Js+BVoiAX06qwZ9jQoncgkz3M1jRCnygrq3E9Fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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