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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56b2276ac3d2a961b523bc4a15ae6864796c24005e175e0d245d3133cf3259f2' 
  AND token = '26pixyWmnwjQTKSuaCSxdOUs1s2i7OlKSnSL77Y7BQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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