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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7507a86d13f81b9cde93a88a1504c0d0f4f32f15479141c02e76d76ff19a8397' 
  AND token = 'zQi+/s9rwmnJwIDlGU3dpNuJlnuoE9l8asxOTBlcE60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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