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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '702c7d8986c68d8b0556127af78b56135f902bb66a284fc356f2c488e2f87a02' 
  AND token = 'dni3z89DkF3BO/32vZ6sYATIGbiw83e4tmM1yCtZ0wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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