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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1b1b0b0faae6e3d767566ee79f41cb7490ae01be6ebbcb7697f8c30d1e67e70' 
  AND token = '+clBs8lGXcXiG7ylrg2NmC26iY9Mf5BDq5UMaSDQuCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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