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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faafaf617f625da8d4d1bacec120999717c27a17a6e6cbdddd4b0afe76753125' 
  AND token = '3ddycx2Jt8Zlb40EvkHE0JjI1+EyUJZ56I3JVF7j69s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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