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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcc49ea55b02f99f2d20ed03e79d138a1b8d61f3a6e3c210df5a3169a69537d5' 
  AND token = 'KCMzqloT1DyrvB47ROvCHj1V7p987dsbP7+EfQUa5s4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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