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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f700053715edeaa77b8eaf7f8a2ba52ef0121794a59560ac281127291a5bba6' 
  AND token = 'Pac7KwvlNGe5lkNc82iN9250o61o8Mpb7n5IE6vhw/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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