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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0f08a3e72288ae2342b5c22878c696a57c1edf0fc151e279a5d1d3fbc476773' 
  AND token = 'eRlxxwX/nCsh97rteuRl/lkgFdlWKLnR3Hjpqr4HA7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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