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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f8f953a0d4f32ac089b13484d7213cafdd818abaa7cb6bd81a3733134f27ae2' 
  AND token = 'MZIrBjl3f+ohESBVx/RMcRBqMeXrGrQh1fB7YMMhxZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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