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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af4de406d8a039d45957c3a576a57c4503c40db39890c3af776e034410cd7de8' 
  AND token = 'SV4iOUcfvUx+i92lCLbQPONeVpKEC2Nxozds+0hQaPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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