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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3639d110ada9c780acef9b5024f27597dee0821a993b58787becaa4ed22fc2d' 
  AND token = '/IM5+Ugn+5fcz+g6fXgLsXnlUQyEf1Udb4/W9jpxnV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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