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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9d0058ef8a6595e4cc19b85412ccd73d6be7c248ece852c560d61df17e378e0' 
  AND token = '8gAAdImutPNXWGyET/H1kh8utO4Ef9R2Dk2dkI/vuP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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