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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0adc7f66c627ca74c7e703de2d87e2b3afac4565ae24a0e91fe065fc9bb20e21' 
  AND token = 'N0xJXjnlwUMUG4IVGs4gLkQ7XN+AseT8tTQHaZ9e2wI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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