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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fba2f66b51939726abf6154557c9182efec7ef1ea570661fd94bafe00eada132' 
  AND token = 'VC+CJU593U5HHsaRqRyJCDpPMVtwfb9WFjnkkNZS940=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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