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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f0814a145168b1983566f86d7f41cec24277d2edbfc2d72e60bd8d4ccf18911' 
  AND token = 'pWtrRo1eNWFDS6N+TYYMrtNro8PhP47EHVlhjBy0PcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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