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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c46a5527e6edde8361e38f2572b0d6a093cc5ea131a69d7ecd7a91c212ce11c6' 
  AND token = 'ma8nSLTbC3U3e7tsiIRfsqJd1rdggzOz0mSrWhweC9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00187

JSON explain

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