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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd55efebd7f636d50192d6c1477326680d724e78e22b0d3ae80176e1cbc1ff68' 
  AND token = 'ytsFetpKufSxPL61m0evFG4aTKR0IhhbcK/8kwQBMSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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