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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf74a064c9a0aa95ecb38c202a8f2bf5369e8a11a37af660a3f0890363869e87' 
  AND token = 'uHI9E6w2Jyk0DnRfXm4KPm62HgCuEEueClZ0d+oJ+k0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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