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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ad26892b92b7e2ef0eac0d4afa376732cdc99e4839eae0d933fa8122eeaba8c' 
  AND token = 'S6J7KD9t9DTt6L8Pv1GxAI6B5NsFwnuJiu4bd9s2BVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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