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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd20b980d181cca5ea18ca485d78aa2ba13b7d5e885a2a3f02ab70bf594c372cc' 
  AND token = 'BOl2oD0wFHFzhiPsLW8lrmzOfDL2x4SVFJ/julwugiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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