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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12dacfe6780c55c1b07e8d1961da7b28c77b25cb7a58113bc8abbb2512a4ae8a' 
  AND token = '43dGXBb/PFHk3Mcofa5nmJftM2VitM/LFfWJoij/Y2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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