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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c895fbfe413d344fba29e3a60ba810c59d530ed7651b2e38b63964fd1ee3d48' 
  AND token = '9Gg0wBEgr58+sPFmeFMs1knAQswOUrOiYy62l9IISeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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