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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92eedbb10c768bdaa86f9c55788c7266d24dfde39eb8619d13595cb7afb48ced' 
  AND token = '6UA6+QQL28LfoiW7SEm26ajtpL0czDUwg9fZ4n8FVgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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