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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c87dbce3a2f42761e27bfd85a8642cab5f144e3c73aef42a93fe32f8de2688b0' 
  AND token = '4TTj7eWtP4KFlzXCJB/0llZV/DN1UhcQnftvmEnDTAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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