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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f94c701971da6708f4b7eeaee61b1c3015af33ae2b7aa5c03b881eab1c10f37d' 
  AND token = '/U1xCNj+GVzuuEemYFvmHB1I65l4NsHktki12b8fdBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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