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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af6a908b279d916b4a1575059e5aa88e3b42721cc131e4f0bb43518e4296d6f5' 
  AND token = 'dVLnzmpOigUrxd13F77Qx7gebZL+Jga/14SUx/6ATH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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