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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a309158e3dc9d4c931ca4f6d8459026765cbf631812d9f1c5d90828e17fba858' 
  AND token = 'bhsGuhifJk8fJJwys7ld6T1u/Z05hNKZdADhij6v1cY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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