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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b04841c41ed3d260629d18f9579e51c6d90e75a759f8267146bfee8d0cf113ab' 
  AND token = 'PY59ViYY3bxYOuQnDabJJTJ7x8tMi0moSZ4Pk/m4y+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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