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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b2992c10169fca24cd4191dd8751bf682c2062c25e56e41df7d62aab62b1d83' 
  AND token = '1QGBT1SmIxVS2Nsmvbr7S35ZS8p2z3LKYJiRZYkrZ0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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