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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42e6b455f2e642269c2d1d683c8fd1d2c9cd178415208ebca65f6f9fe616ee63' 
  AND token = 'baWef88G64sqZprZzUyd2fzsvA/fryPjJm2I68Mv0Gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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