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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67e1fd8280e5d750c11ce0673de59378f9037b91570b983013b4ceaef7ff7848' 
  AND token = 'ymrCq4Txl2Sg1OEtI7IodGV/2fxEVXPLH4Va7+jSQBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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