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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b77af1905731f214e4d9e41040d79a2f9729ab0d80c0c0dd1e17a143f419512f' 
  AND token = 'ATXdGNJmG2VwXsch0EFulXSYopfHrFpfQfgqHQJyVpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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