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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10028068399dd97bfb6fccdf4e3f47def78ed885dda50082e33e4e2ad00263a8' 
  AND token = 'MprdeZBMhc25Se9uBbkkq9mTFH4GCwpsDwfishpUH4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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